云大植物地理（Water plant geography）.docVIP

云大植物地理（Water plant geography） Thallophyte, about the times of Archean to late Silurian Paleozoic; changes in atmospheric composition through photosynthesis; fixation of atmospheric CO2, O2 began to release; the formation of the ozone layer; the accumulation of organic matter; changing the earths climate conditions caused by global cooling a variety of niche; as the cornerstone of the animal and plant differentiation lay. Green algae may be the 300 thousand existing higher plants.; 2, fern age: about the late Silurian to Permian; plants from the sea, the Psilophyton represented the first terrestrial plants; the evolutionary direction towards the development of fern sporophyte (sporophyte gamete developed, independent life, physical fitness) of bryophytes is toward the development of gametophyte evolution (gametophyte development, sporophyte parasitic on the gametophyte); the worlds first coal forming period; 3, the gymnosperm era: in Carboniferous and Permian at the turn of the earths natural environment changes, gymnosperms gain advantage in the competition for survival: the root and leaf cuticle developed vascular layer developed, fertilization is no longer dependent on the presence of water; Mesozoic gymnosperms most prosperous period, as the worlds second coal forming period; 4, angiosperms Age: angiosperm development and environment of the earth; Late Cretaceous, angiosperms erupted; the most developed, most species diversity of angiosperms; form is widely adapted to the natural environment and produce a variety of variation results; and the animal kingdom, especially one of the important reasons is the Insect Animal cooperative into the development of Angiosperm Compositae is dicotyledonous plants evolved into the most advanced type, its evolution is characterized by: herbaceous plants, can quickly complete the life cycle, can cause the plant spread quickly, the faster variation from one generation to the next generation of different types of more. Highly conce